A new quantitative method for mapping of the second derivatives of a specular surface and of the refractive index of phase objects is proposed and demonstrated. Since the method is a finite fringe technique it is possible to obtain a third derivative contour map using a shearing moire technique.
© 1983 Optical Society of America
O. Kafri and A. Livnat, "Second and third optical differentiation by double moire deflectometry," Appl. Opt. 22, 2115-2117 (1983)